Posted by LtDan on June 29, 1999 at 23:02:47:
In Reply to: buzzing on mouthpiece posted by Tim B. on June 29, 1999 at 15:11:21:
Mouthpiece buzzing can be one of the most beneficial parts of practicing.  There are a few "do"s and "don't"s however:
Do
   -Use plenty of air;   it's free
   -Buzz your music;   if you can make it sound good on a mp, just wait till it comes out the bell!
Don't
   -Use excessive pressure while buzzing;   this is true while playing as well, but mp buzzing can let you discover bad pressure habits quickly.
Hope this helps.
D